python3kgae added a comment.

In D124751#3529652 <https://reviews.llvm.org/D124751#3529652>, @MaskRay wrote:

> In D124751#3513513 <https://reviews.llvm.org/D124751#3513513>, @python3kgae 
> wrote:
>
>> In D124751#3513283 <https://reviews.llvm.org/D124751#3513283>, @MaskRay 
>> wrote:
>>
>>> Is there a specification or reference implementation stating that -E is 
>>> used?
>>>
>>>> Option<["--", "/", "-"], "E",
>>>
>>> Do you need the prefix `--`? You may define something like `CLFlag`. I have 
>>> missed previous patches, but if `/` options are not necessary, removing 
>>> them will be the best to avoid collision with filenames starting with `/`.
>>
>> Unfortunately, '/' is necessary. dxc allow both '-' and '/' like 'CLFlag'.
>> Remove '/' means existing customers may need to change their command line to 
>> compile hlsl.
>> And add '--' feels not hurt anyone, that's why I choose to add '--' to 
>> work-around the conflict.
>
> OK. I guess you have a pre-existing implementation using `-E` and the 
> upstreaming implementation wants to be compatible.
> I wonder why the new tool needs to reuse 
> `clang/include/clang/Driver/Options.td`. ISTM it would be cleaner to use a 
> new .td file.

That is a good idea.
Let me try that.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D124751/new/

https://reviews.llvm.org/D124751

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